JSFiddle - React, Tailwind, and code Playground

HTML

<input id="search" />

CSS

.ui-autocomplete-term { font-weight: bold; color: black }

JavaScript

$(document).ready(function() {
    var termTemplate = "<span class='ui-autocomplete-term'>%s</span>";
    
    $('#search').autocomplete({
        source: ['java', 'javascript', 'asp.net'],
        open: function(e,ui) {
            var
                acData = $(this).data('autocomplete'),
                styledTerm = termTemplate.replace('%s', acData.term);

            acData
                .menu
                .element
                .find('li')
                .each(function() {
                    var me = $(this);
                    me.html( me.text().replace(acData.term, styledTerm) );
                });
        }
    });
});